Input Source Impedance and Its Effects on DC-DC Converter Performance and Characteristics
A modern DC/DC converter, or actually all of today's switching converters, including AC/DC, typically has a negative input resistance. This can lead to instability if the wrong circuit is used.
This whitepaper from Vicor explains how this negative input resistance arises and how stability can be guaranteed. The whitepaper is written independently of products and manufacturers.
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